Annual U.S. per capita sales of bottled water in the period 2007-2014 can be approximated by B ( t ) = − .25 t 2 + 2 t + 29  gallons Where t is the years since 2007. According to the model, were annual U.S. sales of bottled water accelerating or decelerating in 2011?

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Limits

When it comes to calculus, limits are considered to be a very important topic of discussion. The main importance of limit lies in expressing the value of a function as it gets closer to a certain value. Also, limits can help you to understand other topics, such as continuity and differentiability better. In a broader sense, every calculus notion is a limit. Other branches of calculus have also been derived from limits.